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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

OR

WASHINGTON REAL ESTATE INVESTMENT TRUST

(Exact name of registrant as specified in its charter)

6110 EXECUTIVE BOULEVARD, SUITE 800, ROCKVILLE, MARYLAND 20852

(Address of principal executive office) (Zip code)

Registrant’s telephone number, including area code (301) 984-9400

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding twelve (12) months (or such shorter period that the Registrant was required to file such report) and (2) has been subject to such filing requirements for the past ninety (90) days.    YES  x    NO  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act). (Check One):

Large Accelerated Filer  x    Accelerated Filer  ¨    Non-Accelerated Filer   ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    YES  ¨    NO  x

Number of shares outstanding of common stock, as of November 5, 2007: 46,670,630

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INDEX

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Part I

FINANCIAL INFORMATION

The information furnished in the accompanying unaudited Consolidated Balance Sheets, Statements of Income, Statements of Cash Flows and Statement of Changes in Shareholders’ Equity reflects all adjustments, consisting of normal recurring items, which are, in the opinion of management, necessary for a fair presentation of the financial position, results of operations and cash flows for the interim periods. The accompanying financial statements and notes thereto should be read in conjunction with the financial statements and notes for the three years ended December 31, 2006 included in the Trust’s 2006 Annual Report on Form 10-K filed with the Securities and Exchange Commission.

ITEM I. FINANCIAL STATEMENTS

WASHINGTON REAL ESTATE INVESTMENT TRUST

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share amounts)

See accompanying notes to the financial statements.

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CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(In thousands, except per share amounts)

(UNAUDITED)

See accompanying notes to the financial statements.

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CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS’ EQUITY

(In thousands)

(UNAUDITED)

See accompanying notes to the financial statements.

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CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

See accompanying notes to the financial statements.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

NOTE 1: NATURE OF BUSINESS

Washington Real Estate Investment Trust (“WRIT,” the “Company” or the “Trust”), a Maryland Real Estate Investment Trust, is a self-administered, self-managed equity real estate investment trust, successor to a trust organized in 1960. Our business consists of the ownership and development of income-producing real estate properties in the greater Washington Metro region. We own a diversified portfolio of office buildings, medical office buildings, industrial/flex centers, multifamily properties and retail centers.

Federal Income Taxes

We believe that we qualify as a Real Estate Investment Trust (REIT) under Sections 856-860 of the Internal Revenue Code and intend to continue to qualify as such. To maintain our status as a REIT, we are required to distribute at least 90% of our ordinary taxable income to our shareholders. When selling properties, we have the option of (i) reinvesting the sale price of properties sold, allowing for a deferral of income taxes on the sale, (ii) paying out capital gains to the shareholders with no tax to the company or (iii) treating the capital gains as having been distributed to the shareholders, paying the tax on the gain deemed distributed and allocating the tax paid as a credit to the shareholders. In September 2007, Maryland Trade Centers I and II were sold for a gain of $25.0 million. The proceeds from the sale are expected to be reinvested in replacement properties. No properties were sold in the year 2006.

NOTE 2: ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission. Certain information and note disclosures normally included in annual financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted pursuant to those rules and regulations, although we believe that the disclosures made are adequate to make the information presented not misleading. In addition, in the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included. These unaudited financial statements should be read in conjunction with the financial statements and notes included in our Annual Report on Form 10-K for the year ended December 31, 2006.

Within these notes to the financial statements, we refer to the three and nine months ended September 30, 2007 as the “2007 Quarter” and the “2007 Period”, respectively, and the three and nine months ended September 30, 2006 as the “2006 Quarter” and the “2006 Period”, respectively.

New Accounting Pronouncements

In July 2006, the FASB issued Interpretation No. 48, “Accounting for Uncertainty in Income Taxes,” an interpretation of SFAS 109, “Accounting for Income Taxes” (FIN 48), FIN 48 prescribes how we should recognize, measure and present in our financial statements uncertain tax positions that have been taken or are expected to be taken in a tax return. Pursuant to FIN 48, we can recognize a tax benefit only if it is “more likely than not” that a particular tax position will be sustained upon examination or audit. To the extent the “more likely than not” standard has been satisfied, the benefit associated with a tax position is measured as the largest amount that is greater than 50% likely of being realized upon settlement.

We are subject to U.S. federal income tax as well as income tax of the states of Maryland and Virginia and the District of Columbia but, as a REIT, we generally are not subject to income tax on our net income distributed as dividends to our shareholders. As required, we adopted FIN 48 effective January 1, 2007 and have concluded that the effect is not material to our consolidated financial statements. Accordingly, we did not record a cumulative effect adjustment related to the adoption of FIN 48.

Tax returns filed for the 2003 through 2006 tax years are subject to examination by taxing authorities. We classify interest and penalties related to uncertain tax positions, if any, in our financial statements as a component of general and administrative expense.

In September 2006, the FASB also issued FASB Statement No. 157, “Fair Value Measurements”. SFAS No. 157 defines fair value, establishes a framework for measuring fair value in U.S. generally accepted accounting principles, and expands disclosures about fair

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

value measurements. The effective date of this statement is for fiscal years beginning after November 15, 2007 and accordingly all the provisions of SFAS No. 157 will be considered when we adopt it in January 2008. We are currently evaluating the provisions of this revision to determine the impact on our consolidated financial statements.

In February 2007, the FASB issued SFAS No. 159, “The Fair Value Option for Financial Assets and Financial Liabilities – Including an Amendment of FASB Statement No. 115.” SFAS No. 159 permits entities to choose to measure eligible items at fair value at specified election dates and report unrealized gains and losses on items for which the fair value option has been elected in earnings at each subsequent reporting date. SFAS No. 159 is effective for fiscal years beginning after November 15, 2007. We are currently evaluating what effect, if any, the adoption of SFAS No. 159 will have on our financial position, results of operations, or cash flows.

The FASB has released an exposure draft of FASB Staff Position (FSP) APB 14-a for comment. This proposed guidance clarifies the accounting for convertible debt instruments that may be settled in cash (including partial cash settlement) upon conversion. If issued in final form, the guidance will significantly impact the accounting of the Company’s convertible debt. The proposed FSP would require bifurcation of a component of the debt, classification of that component in stockholders’ equity, and then accretion of the resulting discount on the debt to result in interest expense equal to issuer’s nonconvertible debt borrowing rate. The calculation of earnings-per-share would not be affected, other than the impact on net income from the debt discount amortization. The Company is in the process of assessing the impact of the FSP on its financial statements.

Revenue Recognition

Residential properties (our multifamily segment) are leased under operating leases with terms of generally one year or less, and commercial properties (our office, medical office, retail and industrial segments) are leased under operating leases with average terms of three to seven years. We recognize rental income and rental abatements from our residential and commercial leases when earned on a straight-line basis in accordance with SFAS No. 13 “Accounting for Leases.” Recognition of rental income commences when control of the facility has been given to the tenant. We record a provision for losses on accounts receivable equal to the estimated uncollectible amounts. This estimate is based on our historical experience and a review of the current status of the Company’s receivables. Percentage rents, which represent additional rents based on gross tenant sales, are recognized when tenants’ sales exceed specified thresholds.

In accordance with SFAS No. 66, “Accounting for Sales of Real Estate,” sales are recognized at closing only when sufficient down payments have been obtained, possession and other attributes of ownership have been transferred to the buyer and we have no significant continuing involvement.

We recognize cost reimbursement income from pass-through expenses on an accrual basis over the periods in which the expenses were incurred. Pass-through expenses are comprised of real estate taxes, operating expenses and common area maintenance costs which are reimbursed by tenants in accordance with specific allowable costs per tenant lease agreements.

Minority Interest

We entered into an operating agreement with members of a limited liability company (LLC) that previously owned Northern Virginia Industrial Park in conjunction with the acquisition of this property in May 1998. This resulted in a minority ownership interest in this limited liability company based upon defined company ownership units at the date of purchase. We account for this activity by recording minority expense by applying the minority owner’s percentage ownership interest to the net income of the property and including such amount in our general and administrative expenses, thereby reducing net income.

In August 2007 WRIT acquired a 0.8 acre parcel of land located at 4661 Kenmore Avenue, Alexandria, Virginia for future medical office development. The acquisition was funded by issuing operating units in a consolidated subsidiary of WRIT.

Minority interest expense was $101,000 and $207,000 for the 2007 Quarter and 2007 Period, respectively, and $52,000 and $148,000 for the 2006 Quarter and 2006 Period, respectively. Quarterly distributions are made to the minority owners equal to the quarterly dividend per share for each ownership unit.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Deferred Financing Costs

External costs associated with the issuance or assumption of mortgages, notes payable and fees associated with the lines of credit are capitalized and amortized using the effective interest rate method or the straight-line method which approximates the effective interest rate method over the term of the related debt. As of September 30, 2007 and December 31, 2006, the deferred financing costs of $23.9 million and $16.6 million, respectively, net of accumulated amortization of $7.2 million and $5.5 million, respectively, were included in Prepaid Expenses and Other Assets on the balance sheets. The amortization is included in interest expense on the accompanying consolidated statements of income. The amortization of debt costs included in interest expense totaled $0.7 million and $1.8 million for the 2007 Quarter and 2007 Period, respectively, and $0.4 million and $1.2 million for the 2006 Quarter and 2006 Period, respectively.

Deferred Leasing Costs

Costs associated with the successful negotiation of leases, both external commissions and internal direct costs, are capitalized and amortized on a straight-line basis over the terms of the respective leases. If an applicable lease terminates prior to the expiration of its initial lease term, the carrying amount of the costs are written-off to expense. As of September 30, 2007 and December 31, 2006, deferred leasing costs of $22.7 million and $19.0 million, respectively, net of accumulated amortization of $7.9 million and $6.5 million, respectively, were included in Prepaid and Other Assets on the balance sheets. The amortization of deferred leasing costs included in expense for properties classified as continuing operations totaled $0.8 million and $0.7 million for the 2007 and 2006 Quarters, respectively, and $2.3 million and $1.8 million for the 2007 and 2006 Periods, respectively.

Real Estate and Depreciation

Buildings are depreciated on a straight-line basis over estimated useful lives ranging from 28 to 50 years. All capital improvement expenditures associated with replacements, improvements, or major repairs to real property that extend its useful life are capitalized and depreciated using the straight-line method over their estimated useful lives ranging from 3 to 30 years. We also capitalize costs incurred in connection with our development projects, including capitalizing interest and other internal costs during periods in which development projects are in progress. In addition, we capitalize tenant leasehold improvements when certain criteria are met, including when we supervise construction and will own the improvements. All tenant improvements are amortized over the shorter of the useful life of the improvements or the term of the related tenant lease. Real estate depreciation expense, for properties classified as continuing operations, was $15.0 million and $11.8 million for the 2007 and 2006 Quarters, respectively, and $41.6 million and $33.0 million for the 2007 and 2006 Periods, respectively. Maintenance and repair costs are charged to expense as incurred.

We capitalize interest costs recognized on borrowing obligations while qualifying assets are being readied for their intended use in accordance with SFAS No. 34, “Capitalization of Interest Cost.” Total interest expense capitalized to real estate assets related to development and major renovation activities was $1.7 million and $4.6 million for the 2007 Quarter and Period, respectively, and $1.0 million and $2.5 million for the 2006 Quarter and Period, respectively. Interest capitalized is depreciated over the useful life of the related underlying assets when those assets are placed into service upon completion of development or construction.

We recognize impairment losses on long-lived assets used in operations, development assets or land held for future development, if indicators of impairment are present and the net undiscounted cash flows estimated to be generated by those assets are less than the assets’ carrying amount and estimated undiscounted cash flows associated with future development expenditures. If such carrying amount is in excess of the estimated cash flows from the operation and disposal of the property, we would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to the estimated fair market value. There were no property impairments recognized during the 2007 and 2006 Quarters or the 2007 and 2006 Periods.

We allocate the purchase price of acquired properties to the related physical assets and in-place leases based on their fair values, in accordance with SFAS No. 141, “Business Combinations.” The fair values of acquired buildings are determined on an “as-if-vacant” basis considering a variety of factors, including the physical condition and quality of the buildings, estimated rental and absorption rates, estimated future cash flows and valuation assumptions consistent with current market conditions. The “as-if-vacant” fair value is allocated to land, building and tenant improvements based on property tax assessments and other relevant information obtained in connection with the acquisition of the property.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

The fair value of in-place leases consists of the following components – (1) the estimated cost to us to replace the leases, including foregone rents during the period of finding a new tenant and foregone recovery of tenant pass-through expenses (referred to as “Absorption Cost”); (2) the estimated cost of tenant improvements and other direct costs associated with obtaining a new tenant (referred to as “Tenant Origination Cost”); (3) estimated leasing commissions associated with obtaining a new tenant (referred to as “Leasing Commissions”); (4) the above/at/below market cash flow of the leases, determined by comparing the projected cash flows of the leases in place to projected cash flows of comparable market-rate leases (referred to as “Net Lease Intangibles”); and (5) the value, if any, of customer relationships, determined based on our evaluation of the specific characteristics of each tenant’s lease and our overall relationship with the tenant (referred to as “Customer Relationship Value”).

Tenant Origination Costs are included in Income Producing Property Assets on our balance sheets and are amortized as depreciation expense on a straight-line basis over the remaining life of the underlying leases. Leasing Commissions and Absorption Costs are classified as Other Assets and are amortized as amortization expense on a straight-line basis over the remaining life of the underlying leases. The amounts used to calculate Net Lease Intangibles are discounted using an interest rate which reflects the risks associated with the leases acquired. Net Lease Intangible Assets are classified as Other Assets and are amortized on a straight-line basis as a decrease to Real Estate Rental Revenue over the remaining term of the underlying leases. Net Lease Intangible Liabilities are classified as Other Liabilities and are amortized on a straight-line basis as an increase to Real Estate Rental Revenue over the remaining term of the underlying leases. Should a tenant terminate its lease, the unamortized portions of the Tenant Origination Cost, Leasing Commissions and Absorption Costs and Net Lease Intangibles associated with that lease are written off to depreciation expense, amortization expense, and rental revenue, respectively.

Balances net of accumulated depreciation or amortization, as appropriate, of the components of the fair value of in-place leases at September 30, 2007 and December 31, 2006 are as follows (in millions):

Amortization of these components combined was $2.2 million and $6.4 million for the 2007 Quarter and Period, respectively, and $1.1 million and $2.7 million for the 2006 Quarter and Period, respectively. No value had been assigned to Customer Relationship Value at September 30, 2007 or December 31, 2006.

Discontinued Operations

We classify properties as held for sale when they meet the necessary criteria specified by SFAS No. 144, “Accounting for the Impairment or Disposal of Long-Lived Assets”. These criteria include: senior management commits to and actively embarks upon a plan to sell the assets, the sale is expected to be completed within one year under terms usual and customary for such sales, and actions required to complete the plan indicate that it is unlikely that significant changes to the plan will be made or that the plan will be withdrawn. Depreciation on these properties is discontinued, but operating revenues, operating expenses and interest expense continue to be recognized until the date of sale.

Under SFAS No. 144, revenues and expenses of properties that are either sold or classified as held for sale are presented as discontinued operations for all periods presented in the Consolidated Statements of Income.

Cash and Cash Equivalents

Cash and cash equivalents include investments readily convertible to known amounts of cash with original maturities of 90 days or less.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Restricted Cash

Restricted cash at September 30, 2007 and December 31, 2006 consisted of $46.0 million and $4.2 million, respectively, in funds escrowed for tenant security deposits for certain tenants, real estate tax, insurance and mortgage escrows and escrow deposits required by lenders on certain of our properties to be used for future building renovations or tenant improvements. The balance at September 30, 2007 also included $40.1 million in tax-free exchange account funds resulting from the sale of Maryland Trade Centers I and II during the 2007 Quarter.

Share Based Compensation

We maintain Share Grant Plans and Incentive Stock Option Plans as described in Note 7, Share Options and Grants, which include qualified and non-qualified options and deferred shares for eligible employees. Shares are granted to officers, non-officer employees and trustees under the Share Grant Plans. Officer share grants vesting over five years vest in annual installments commencing one year after the date of grant and share grants that vest over three years vest twenty-five percent one year from date of grant, twenty-five percent two years from date of grant and fifty percent three years from date of grant. Officer performance share units, granted under an amendment to the Share Grant Plan, cliff vest at the end of a three-year performance period. Officer and non-officer employee restricted share units, granted under an amendment to the Share Grant Plan, vest over five years in annual installments commencing one year after date of grant. Trustee share grants are fully vested immediately upon date of share grant and are restricted from sale for the period of the trustees’ service. Restricted share units issued to the non-executive Chairman vest over three years from the grant date and are restricted from sale for the period of the non-executive Chairman’s service.

Compensation expense is recognized for share grants over the vesting period equal to the fair market value of the shares on the date of issuance. Compensation expense for trustee grants that vest immediately upon the grant date is fully recognized upon issuance based upon the fair market value of the shares on the date of grant. The unvested portion of officer and non-officer employee share grants is recognized in compensation cost over the vesting period.

Unvested shares are forfeited upon an employee’s termination while unvested shares for employees eligible for retirement fully vest upon retirement. For shares granted to employees who are eligible for retirement or will become eligible for retirement during the vesting period, compensation cost is recognized over the explicit service period with acceleration of expense upon determination of the date of actual retirement for these employees. The Company will continue this practice for awards granted prior to January 1, 2006, when FAS 123R was adopted, and for shares granted after the adoption of FAS 123R the Company will recognize compensation expense through the date that the employee is no longer required to provide service to earn the award (e.g. the date the employee is eligible to retire).

Stock options were historically issued annually to officers, trustees and key non-officer employees under the Incentive Stock Option Plans. They were last issued to officers in 2002, to key non-officer employees in 2003 and to trustees in 2004. The options vested over a two-year period in annual installments commencing one year after the date of grant, except for trustee options which vested immediately upon the date of grant. Stock options issued prior to the adoption of FAS No. 123R are accounted for in accordance with APB No. 25, whereby if options are priced at fair market value or above at the date of grant and if other requirements are met then the plans are considered fixed and no compensation expense is recognized. Accordingly, we recognized no compensation expense for stock options.

Earnings per Common Share

We calculate basic and diluted earnings per share in accordance with SFAS No. 128, “Earnings per Share.” Basic earnings per share is computed as net income divided by the weighted-average common shares outstanding. Diluted earnings per share is computed as net income divided by the total weighted-average common shares outstanding plus the effect of dilutive common equivalent shares outstanding for the period. Dilutive common equivalent shares reflect the assumed issuance of additional common shares pursuant to certain of our share based compensation plans and operating partnership units that could potentially reduce or “dilute” earnings per share, based on the treasury stock method. Other potentially dilutive common shares, including shares potentially resulting from the senior convertible notes, are considered when calculating diluted earnings per share.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Use of Estimates in the Financial Statements

The preparation of financial statements in conformity with U. S. generally accepted accounting principles requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Reclassifications

Certain prior year amounts have been reclassified to conform to the current year presentation.

NOTE 3: REAL ESTATE INVESTMENTS

Our real estate investment portfolio, at cost, consists of properties located in Maryland, Washington, D.C. and Virginia as follows (in thousands):

The amounts above reflect properties classified as continuing operations, which means they are to be held and used in rental operations (income producing property).

We have several properties in development in our office and multifamily sectors and one property in our retail sector that was in redevelopment for most of 2006, but was placed in service in 2006. The mid rise building at Bennett Park is substantially complete and was 70% leased at 2007 quarter end. At Dulles Station, the building shell completion occurred early in the third quarter 2007.The cost of our real estate portfolio in development is illustrated below (in thousands):

We dispose of assets (sometimes using tax-deferred exchanges) that are inconsistent with our long-term strategic or return objectives and when market conditions for sale are favorable. The proceeds from the sales may be redeployed into other properties, used to fund development operations or to support other corporate needs, or distributed to our shareholders. Properties are considered held for sale when they meet the criteria specified by SFAS No.144 (see Note 2 – Discontinued Operations). Depreciation on these properties is discontinued at that time, but operating revenues, other operating expenses and interest continue to be recognized until the date of sale. Two properties, Maryland Trade Centers I and II, were sold as of September 30, 2007 and classified as held for sale at December 31, 2006. The two properties were classified as discontinued operations in the 2007 and 2006 Quarters and Periods. They were sold for a contract sales price of $58.0 million that resulted in a gain on sale of $25.0 million.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Operating results of the properties classified as discontinued operations are summarized as follows (in thousands):

Operating income by property is summarized below (in thousands):

Our results of operations are dependent on the overall economic health of our markets, tenants and the specific segments in which we own properties. These segments include commercial office, medical office, retail, multifamily and industrial. All sectors are affected by external economic factors, such as inflation, consumer confidence, unemployment rates, etc., as well as by changing tenant and consumer requirements.

WRIT acquired the following properties during the first nine months of 2007:

As discussed in Note 2, we allocate the purchase price to the related physical assets (land, building and tenant improvements) and in-place leases (absorption, tenant origination costs, leasing commissions, and net lease intangible assets/liabilities) based on their fair values, in accordance with SFAS No. 141, “Business Combinations.” Our acquisition of the properties listed above resulted in the recognition of $8.4 million in absorption costs and $3.0 million in leasing commissions, $0.4 million in net intangible lease assets, $8.3 million in tenant origination costs and $4.8 million in net intangible lease liabilities. The weighted average life of these assets ranges from 10 to 115 months. The results of operations from these acquired properties are included in the income statement as of their respective acquisition date and forward.

The purchase of 270 Technology Park in February 2007 was funded from the proceeds of our convertible debt offering in January 2007. The purchase of Monument II in March 2007 was funded with proceeds from the January 2007 convertible debt offering and borrowings of $30.0 million on our line of credit. The purchases of 2440 M Street, Woodholme Center, Woodholme Medical Office Building, Ashburn Farm Park and CenterMed properties were funded by borrowings on our line of credit. The borrowings for a portion of these acquisitions were outstanding as of September 30, 2007. CentreMed was acquired through partial reverse tax deferred

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

exchange from the sale of Maryland Trade Centers I and II in September 2007. The purchase of 4661 Kenmore Avenue was funded by issuing operating units in a consolidated subsidiary (see Note 2-Minority Interest). For the purchase of Woodholme Medical Office Building and Ashburn Farm Park, mortgages were assumed for $21.2 million and $6.1 million, respectively. See discussion of the mortgages in Note 4.

The following unaudited pro-forma combined condensed statements of operations present the consolidated results of operations for the 2007 Quarter and Period and the 2006 Quarter and Period, as if the above described acquisitions had occurred at the beginning of the period of acquisition and the same period in the year prior to the acquisition. The unaudited pro-forma information does not purport to be indicative of the results that actually would have occurred if the acquisitions had been in effect for the Quarters and Periods presented. The unaudited data presented is in millions, except per share data.

NOTE 4: MORTGAGE NOTES PAYABLE

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Total carrying amount of the above mortgaged properties was $447.1 million and $422.0 million at September 30, 2007 and December 31, 2006, respectively. Scheduled principal payments for the remaining three months in 2007 and the remaining years subsequent to December 31, 2007 are as follows (in thousands):

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

NOTE 5: UNSECURED LINES OF CREDIT PAYABLE

As of September 30, 2007, we maintained a $75.0 million unsecured line of credit maturing in June 2011 (“Credit Facility No. 1”) and a $200.0 million line of credit maturing in November 2010 (“Credit Facility No. 2”).

Credit Facility No. 1

Credit Facility No. 1 replaced Credit Facility No. 4 (see below) on June 29, 2007. We had $33.0 million outstanding as of September 30, 2007 related to Credit Facility No. 1, and $1.4 million in Letters of Credit issued, with $40.6 million unused and available capacity. During the quarter, $15.0 million was borrowed in August to fund the acquisition of CentreMed and $18.0 million was borrowed to fund development costs, certain capital improvements to real estate and acquisition related due diligence costs.

Borrowings under the facility bear interest at WRIT’s option of LIBOR plus a spread based on the credit rating on our publicly issued debt or SunTrust Bank’s prime rate. For both the 2007 Quarter and 2007 Period, we incurred interest expense (excluding facility fees) of $176,000, representing an average interest rate of 5.81% per annum.

In addition, WRIT pays a facility fee currently equal to 0.125% of the $75.0 million committed capacity, without regard to usage. Rates and fees may be adjusted up or down based on changes in WRIT’s senior unsecured credit ratings. For both the 2007 Quarter and 2007 Period, we incurred facility fees of $26,800.

Credit Facility No. 2

We had $95.5 million outstanding as of September 30, 2007 related to Credit Facility No. 2, and $0.9 million in Letters of Credit issued, with $103.6 million unused and available capacity. There was $33.0 million outstanding under this facility at December 31, 2006. There were no new advances under this facility during the 2007 Quarter.

Advances under this agreement bear interest at WRIT’s option of LIBOR plus a spread based on the credit rating on our publicly issued debt or the higher of Wells Fargo Bank’s prime rate and the Federal Funds Rate in effect on that day plus 0.5%. All outstanding advances are due and payable upon maturity in November 2010. Interest only payments are due and payable generally on a monthly basis. For the 2007 Quarter and 2007 Period, we incurred interest expense (excluding facility fees) of approximately $1.4 million and $3.2 million respectively, representing an average interest rate of 5.80% and 5.79%, respectively, per annum.

Currently, Credit Facility No. 2 requires us to pay the lender a facility fee on the total commitment of 0.15% per annum. These fees are payable quarterly. For the 2007 Quarter and 2007 Period, we incurred facility fees of $77,000 and $227,500, respectively.

Credit Facility No. 3

This $85.0 million line of credit with Bank One, NA (now J.P. Morgan) and Wells Fargo Bank, National Association was terminated on November 2, 2006 and replaced with Credit Facility No. 2. Advances under this agreement bore interest at LIBOR plus a spread based on the credit rating of our publicly issued debt. There were no borrowings outstanding and payable under the facility upon the termination of the agreement in November 2006. Interest only payments were due and payable generally on a monthly basis. We incurred $129,200 and $684,100 in interest expense (excluding facility fees) for the 2006 Quarter and 2006 Period, respectively, representing an average interest rate of 5.92% and 5.63%, respectively, per annum.

Credit Facility No. 3 required us to pay the lender a facility fee on the total commitment of 0.15% per annum, based on the credit rating on our publicly issued debt. These fees were payable quarterly. We incurred facility fees of $32,600 and $96,300 for the 2006 Quarter and 2006 Period, respectively.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2007

(UNAUDITED)

Credit Facility No. 4

Credit Facility No. 4 was replaced by Credit Facility No. 1 on June 29, 2007. At December 31, 2006, $28.0 million was outstanding under this facility. During the first quarter, $28.0 million of gross borrowing was repaid with proceeds from the $150.0 million 3.875% convertible notes issued in January 2007. Advances under this agreement bore interest at LIBOR plus a spread based on the credit rating on our publicly issued debt. Interest only payments were due and payable on a monthly basis. We incurred $96,400 in interest expense (excluding facility fees) for the 2007 Period, representing an average interest rate of 5.90%. We incurred $0.5 million and $1.7 million in interest expense (excluding facility fees) for the 2006 Quarter and 2006 Period, respectively, representing an average interest rate of 5.90% and 5.48%, respectively, per annum.

Credit Facility No. 4 required us to pay the lender an annual facility fee on the total commitment of 0.15% per annum. These fees were payable quarterly. We incurred facility fees of $52,800 for the 2007 Period. For the 2006 Quarter and 2006 Period, we incurred facility fees of $26,800 and $83,100, respectively.

Credit Facility No. 1 and No. 2 contain certain financial and non-financial covenants, all of which we have met as of September 30, 2007.

NOTE 6: NOTES PAYABLE

On August 13, 1996, we issued $50.0 million of 7.25% unsecured 10-year notes due August 13, 2006 at 98.166% of par resulting in an effective interest rate of 7.49%. Net proceeds to the Trust after deducting underwriting expenses were $48.8 million. These notes were paid in full on August 13, 2006, with advances from our lines of credit.

On February 20, 1998, we issued $50.0 million of 7.25% unsecured notes due February 25, 2028 at 98.653% to yield approximately 7.36%. We also sold $60.0 million in unsecured Mandatory Par Put Remarketed Securities (“MOPPRS”) at an effective borrowing rate through the remarketing date (February 2008) of approximately 6.74%. In February 2008, if the remarketing dealer elects not to remarket the MOPPRS, the Trust is required to redeem the MOPPRS at par. If the remarketing dealer elects to remarket the securities in February 2008, the interest rate on the MOPPRS will be established at a rate of 5.598% plus the Trust’s applicable credit spread, currently approximately 190-200 basis points, for the Trust’s securities with similar maturities. The MOPPRS may be redeemed, at the Trust’s option, immediately prior to their remarketing in February 2008 at an optional redemption price equal to the outstanding principal balance plus a prepayment penalty (generally equivalent to the make-whole amount necessary to compensate for the amount by which the base rate of 5.598% exceeds the then-existing 10-year treasury rate). Our costs of the borrowings and related closed hedge settlements of approximately $7.2 million are amortized over the lives of the notes using the effective interest method.

On March 17, 2003, we issued $60.0 million of 5.125% unsecured notes due March 2013. The notes bear an effective interest rate of 5.23%. Our total proceeds, net of underwriting fees, were $59.1 million. We used portions of the proceeds of these notes to repay advances on our lines of credit and to fund general corporate purposes.

On December 11, 2003, we issued $100.0 million of 5.25% unsecured notes due January 2014. The notes bear an effective interest rate of 5.34%. Our total proceeds, net of underwriting fees, were $99.3 million. We used portions of the proceeds of these notes to repay advances on our lines of credit.

On April 26, 2005, we issued $50.0 million of 5.05% senior unsecured notes due May 1, 2012 and $50.0 million of 5.35% senior unsecured notes due May 1, 2015, at effective yields of 5.064% and 5.359% respectively. The net proceeds from the sale of the notes of $99.1 million were used to repay borrowings under our lines of credit totaling $90.5 million and the remainder was used for general corporate purposes.

On October 6, 2005 we issued an additional $100.0 million of notes of the series of 5.35% senior unsecured notes due May 1, 2015, at an effective yield of 5.49%. $93.5 million of the $98.1 million net proceeds from the sale of these notes was used to repay borrowings under our lines of credit and to fund general corporate purposes.

On June 6, 2006, we issued $100.0 million of 5.95% unsecured notes due June 15, 2011 at 99.951% of par, resulting in an effective interest rate of 5.96%. Our total proceeds, net of underwriting fees, were $99.4 million. We used the proceeds of these notes to repay advances on one of our lines of credit.

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SEPTEMBER 30, 2007

(UNAUDITED)

On July 26, 2006 we issued an additional $50.0 million of the series of 5.95% unsecured notes due June 15, 2011 at 100.127% of par, resulting in an effective yield of 5.92%. Our total proceeds, net of underwriting fees, were $50.2 million. We used the proceeds of these notes to repay borrowings under our lines of credit and to fund general corporate purposes.

On September 11, 2006, we issued $100.0 million of 3.875% senior convertible notes due September 15, 2026. On September 22, 2006, we issued an additional $10.0 million of these notes, upon the exercise by the underwriter of an over-allotment option granted by WRIT. The notes were issued at 99.5% of par, resulting in an effective interest rate of 4.000%. Our total proceeds, net of underwriting fees, were $106.7 million. We used the proceeds of these notes to repay borrowings under our lines of credit and to fund general corporate purposes.

On January 22, 2007, we issued an additional $135.0 million of the 3.875% senior convertible notes due September 15, 2026. On January 30, 2007, we issued an additional $15.0 million of these notes, upon the exercise by the underwriter of an over-allotment option granted by WRIT. The notes were issued at 100.5% of par, resulting in an effective interest rate of 4.003%. Our total proceeds, net of underwriting fees, were $146.0 million. We used the proceeds of these notes to fund the acquisition of 270 Technology Park and a portion of the acquisition of Monument II, to repay borrowings under our lines of credit, and to fund general corporate purposes.

The senior convertible notes are convertible into shares of our common stock, at the option of the holder, under specific circumstances or on or after July 15, 2026, at an initial exchange rate of 20.090 shares of common stock per $1,000 principal amount of notes. This is equivalent to an initial conversion price of $49.78 per share, which represents a 22% premium over the $40.80 closing price of our shares at the time the September 2006 transaction was priced and a 21% premium over the $41.17 closing price of our shares at the time the January 2007 transaction was priced. Holders may convert their notes into shares of our common stock prior to the maturity date based on the applicable conversion rate during any fiscal quarter if the closing price of our common stock for at least 20 trading days in the 30 consecutive trading day period ending on the last trading day of the immediate preceding fiscal quarter is more than 130% of the conversion price per share on the last day of such preceding fiscal quarter. The initial conversion rate is subject to adjustment in certain circumstances including an adjustment to the rate if the quarterly dividend rate to common shareholders is in excess of $0.4125 per share. In addition, the conversion rate will be adjusted if we make distributions of cash or other consideration by us or any of our subsidiaries in respect of a tender offer or exchange offer for our common stock, to the extent such cash and the value of any such other consideration per share of common stock validly tendered or exchanged exceeds the closing price of our common stock as defined in the note offering. Upon an exchange of notes, we will settle any amounts up to the principal amount of the notes in cash and the remaining exchange value, if any, will be settled, at our option, in cash, common shares or a combination thereof. The senior convertible notes could have a dilutive impact on our earnings per share calculation in the future. However, these notes are not dilutive in the period and not included in our earnings per share calculations.

On or after September 20, 2011, we may redeem the notes at a redemption price equal to the principal amount of the notes plus any accrued and unpaid interest, if any, up to, but excluding, the purchase date. In addition, on September 15, 2011, September 15, 2016 and September 15, 2021 or following the occurrence of certain change in control transactions prior to September 15, 2011, holders of these notes may require us to repurchase the notes for an amount equal to the principal amount of the notes plus any accrued and unpaid interest thereon.

The following is a summary of our unsecured note borrowings (in thousands):

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SEPTEMBER 30, 2007

(UNAUDITED)

The required principal payments excluding the effects of note discounts or premium for the remaining three months in 2007 and the remaining years subsequent to December 31, 2007 are as follows (in thousands):

Interest on these notes is payable semi-annually. All of the notes include certain non-financial covenants, and the non-convertible notes also include certain financial covenants, with which we must comply. The financial covenants include limits on our total debt, limits on our secured debt, limits on our required debt service payments and maintenance of a minimum level of unencumbered assets. We were in compliance with all of our note covenants as of September 30, 2007.

The covenants under the line of credit agreements require us to insure our properties against loss or damage in the amount of the replacement cost of the improvements at the properties. The covenants for the notes require us to keep all of our insurable properties insured against loss or damage at least equal to their then full insurable value. We have an insurance policy which has no terrorism exclusion; however, our financial condition and results of operations are subject to the risks associated with acts of terrorism and the potential for uninsured losses as the result of any such acts. Effective November 26, 2002, under this existing coverage, any losses caused by certified acts of terrorism would be partially reimbursed by the United States under a formula established by federal law. Under this formula the United States pays 85% of covered terrorism losses exceeding the statutorily established deductible paid by the insurance provider, and insurers pay 10% until aggregate insured losses from all insurers reach $100 billion in a calendar year. If the aggregate amount of insured losses under the Act exceeds $100 billion during the applicable period for all insured and insurers combined, then each insurance provider will not be liable for payment of any amount which exceeds the aggregate amount of $100 billion. This legislation expires December 31, 2007.

NOTE 7: BENEFIT PLANS

Share Options and Grants

Options

We adopted the Washington Real Estate Investment Trust 2001 Stock Option Plan to replace the 1991 Stock Option Plan that expired on June 25, 2001. The plans provided for the grant of qualified and non-qualified options. Options granted under the plans were granted with exercise prices equal to the market price on the date of grant vested 50% after year one and 50% after year two and expire ten years following the date of grant. We adopted the Washington Real Estate Investment Trust Stock Option Plan for Trustees in March 1998. Options granted to trustees were granted with exercise prices equal to the market price on the date of grant and were fully vested on the grant date. The last option awards to officers were in 2002, to non-officer key employees in 2003 and to trustees in 2004. Effective 2005 officers, non-officer key employees, and trustees received annual awards of share grants only.

Activity under the Plans is summarized below:

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SEPTEMBER 30, 2007

(UNAUDITED)

The 441,000 options outstanding at September 30, 2007, all of which are exercisable, have exercise prices between $14.47 and $33.09, with a weighted-average exercise price of $24.41 and a weighted average remaining contractual life of 4.4 years. The aggregate intrinsic value of outstanding exercisable shares at September 30, 2007 was $3.9 million. The aggregate intrinsic value of options exercised in 2007 was $120,000. There have been no forfeitures of options for the 2007 Period.

Share Grants, Performance Share Units and Restricted Share Units

We maintain a Share Grant Plan for officers, trustees, and other members of management.

In 2004 and 2005, awards were granted to officers and other members of management in the form of restricted shares, with a value equal to various percentages of a participant’s salary based upon WRIT’s performance compared to an appropriate benchmark target, with minimum and maximum thresholds. The awards were valued based on market value at the date of grant. Shares vest ratably over a five year period from the date of grant.

In December 2006, the WRIT Board of Trustees approved written amendments to the Share Grant Plan providing for the granting of restricted share units to officers and other members of management and performance share units to officers based upon various percentages of their salaries and their positions with WRIT. For officers, one-third of the award will be in the form of restricted share units that vest twenty percent per year based upon continued employment and two-thirds of the award will be in the form of performance share units. Performance targets will be set annually based on appropriate benchmarks with minimum and maximum thresholds. The performance share unit awards are based on cumulative performance over three years, and will cliff vest at the end of the three year period. For other members of management, 100% of the award will be in the form of restricted shares that vest 20% per year from date of grant based on performance targets. WRIT’s Chairman and former CEO was excluded from long-term awards under the Share Grant Plan in view of his announced intention to retire in 2007. With respect to the performance share units, which are based on three-year cumulative performance targets set at the beginning of each year, the grant date does not occur until all such targets are set and thus the significant terms of the award are known. Because payouts are probable, the Company estimates the compensation expense at each reporting period, until the grant date occurs and as progress towards meeting target is known, and recognizes this expense ratably over the three-year period. The estimated expense related to the 2006 performance share units based on the stock price at the end of the period was approximately $1.8 million of which $148,000 and $420,000 were recognized during the 2007 Quarter and 2007 Period, respectively. The estimated expense related to the 2007 performance share units is approximately $2.6 million of which $243,000 and $611,000 were recognized during the 2007 Quarter and 2007 Period, respectively. Participants who terminate prior to the end of the three-year performance period forfeit their entire portion of the award. There were 21,877 restricted share units awarded to officers and other members of management in December 2006 and 24,344 restricted share units awarded to the former CEO in the second quarter of 2007. Performance and restricted share units awarded in 2007 were valued at a weighted average price of $36.97 per share based upon the market value on the date of grant.

In 2004, trustees were awarded 400 share grants each. Beginning in 2005, annual long-term incentive compensation for trustees was changed from options of 2,000 shares plus 400 restricted shares to $30,000 in restricted shares. In May 2007, the value of the restricted shares awarded to trustees was increased to $55,000. These shares vest immediately and are restricted from sale for the period of the trustee’s service.

The following are tables of activity for the quarter ended September 30, 2007 related to our share grants and restricted share unit grants.

There were no shares granted during the 2007 Quarter. The total fair value of shares vested during the Period ending September 30, 2007 is $2.2 million. As of September 30, 2007, the total compensation cost related to non-vested share awards not yet recognized was $1.7 million, which is expected to be recognized over a weighted-average period of 22 months on a straight-line basis.

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SEPTEMBER 30, 2007

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The value of unvested restricted share units at September 30, 2007 was $1.5 million, which is expected to be recognized as compensation cost over a period of 41 months on a straight-line basis.

Total compensation expense recognized for stock based awards in the 2007 and 2006 Quarters was $0.5 million and $0.6 million, respectively and $2.2 million and $2.4 million for the 2007 and 2006 Periods, respectively.

In March 2007, the WRIT Board of Trustees adopted, and in July 2007 WRIT shareholders approved, the Washington Real Estate Investment Trust 2007 Omnibus Long-Term Incentive Plan. This plan will replace the Share Grant Plan, which expires on December 15, 2007, as well as the 2001 Stock Option Plan and Stock Option Plan for Trustees.

The new Plan provides for the award to WRIT’s trustees, officers and employees of restricted shares, restricted share units, options and other awards to acquire up to an aggregate of 2,000,000 shares over the ten year period in which the plan will be in effect. If an award under the new Plan of restricted shares or restricted share units is forfeited or an award of options or other rights granted under the new Plan expires without being exercised, the shares covered by any such award would again become available for issuance under new awards. To date, no grants have been made under the new Plan.

Other Benefit Plans

We have a Retirement Savings Plan (the “401K Plan”), which permits all eligible employees to defer a portion of their compensation in accordance with the Internal Revenue Code. Under the 401K Plan, the Company may make discretionary contributions on behalf of eligible employees. The Company made contributions to the 401K Plan of $94,000 and $292,000, for the 2007 Quarter and 2007 Period, respectively and $80,000 and $233,000 for the 2006 Quarter and 2006 Period, respectively.

We have adopted a non-qualified deferred compensation plan for the officers and members of the Board of Trustees. The plan allows for a deferral of a percentage of annual cash compensation and trustee fees. The plan is unfunded and payments are to be made out of the general assets of the Trust. The deferred compensation liability was $2.0 million and $1.8 million at September 30, 2007 and December 31, 2006, respectively. Effective in 2007 under the Long Term Incentive Plan, elected deferrals of short term incentive awards by officers are converted into restricted share units and WRIT will match 25% of the deferred short term incentive in restricted share units, which vests at the end of three years.

We established a Supplemental Executive Retirement Plan (“SERP”) effective July 1, 2002 for the benefit of the former CEO, who retired on May 31, 2007. Under this plan, upon the former CEO’s termination of employment from the Trust for any reason other than death, discharge for cause, or total and permanent disability he was entitled to receive an annual benefit equal to his accrued benefit times his vested interest. We account for this plan in accordance with SFAS No. 87, “Employers’ Accounting for Pensions,” whereby we accrued benefit cost in an amount resulting in an accrued balance at the end of the former CEO’s employment which is not less than the present value of the estimated benefit payments to be made. We recognized current service cost of $0 and $253,000 for the 2007 Quarter and Period, respectively, and $117,000 and $350,000 for the 2006 Quarter and 2006 Period, respectively. On December 31, 2006, WRIT adopted the recognition and disclosure provisions of SFAS No. 158. SFAS No. 158 requires the Trust to recognize the funded status (i.e., the difference between the fair value of plan assets and the projected benefit obligations) of its pension plan in the September 30, 2007 statement of financial position, with a corresponding adjustment to accumulated other comprehensive income, net of tax. Because the former CEO’s SERP is unfunded, the adoption of SFAS No. 158 did not have an

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effect on the Trust’s consolidated financial condition at September 30, 2007, or for any prior period presented and it will not affect the Trust’s operating results in future periods. The Trust currently has an investment in corporate owned life insurance intended to meet the SERP benefit liability.

In November 2005, the Board of Trustees approved the establishment of a SERP for the benefit of the officers, other than the former CEO. This is a defined contribution plan under which, upon a participant’s termination of employment from the Trust for any reason other than death, discharge for cause, or total and permanent disability the participant will be entitled to receive a benefit equal to the participant’s accrued benefit times the participant’s vested interest. We account for this plan in accordance with EITF 97-14, “Accounting for Deferred Compensation Arrangements Where Amounts Earned are Held in a Rabbi Trust and Invested” and SFAS No. 115, “Accounting for Certain Investments in Debt and Equity Securities,” whereby the investments are reported at fair value, and unrealized holding gains and losses are included in earnings. For the 2007 Quarter and 2007 Period we recognized current service cost of $70,000 and $176,000, respectively and $52,000 and $179,000 for the 2006 Quarter and 2006 Period, respectively. This plan supersedes the split dollar life insurance plan terminated in April 2006. The Company terminated the split dollar agreements regaining ownership of the policies.

In first quarter 2007 upon the death of a retired executive officer, the Company as beneficiary on a life insurance policy, earned proceeds of $1.3 million in excess of cash surrender value, which has been reported as other income in the financial statements for the 2007 Period.

NOTE 8: EARNINGS PER SHARE

The following table sets forth the computation of net income per average share and diluted average shares (in thousands, except per share data):

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NOTE 9: SEGMENT INFORMATION

We have five reportable segments: office buildings, medical office buildings, retail centers, multifamily properties and industrial/flex centers. Office buildings provide office space for various types of businesses and professions. Medical office buildings provide offices and facilities for a variety of medical services. Retail centers are typically neighborhood grocery store or drug store anchored retail centers. Multifamily properties provide housing for families throughout the Washington Metropolitan area. Industrial/flex centers are used for flex-office, warehousing and distribution type facilities.

Real estate revenue as a percentage of total revenue for each of the five reportable operating segments is as follows:

The percentage of total real estate assets, at cost, for each of the five reportable operating segments (excluding properties held for sale and in-development) is as follows:

The accounting policies of each of the segments are the same as those described in Note 2. We evaluate performance based upon operating income from the combined properties in each segment. Our reportable segments are consolidations of similar properties. They are managed separately because each segment requires different operating, pricing and leasing strategies. All of these properties have been acquired separately and are incorporated into the applicable segment.

Segment Information (in thousands):